56-4xx(2xx x-1)=3xx2^2 =>56-4xx(2xx x-1)=3xx4 =>56-4xx(2xx x-1)=12 =>4xx(2xx x-1)=56-12 =>4xx(2xx x-1)=44 =>2xx x-1=44:4 =>2xx x-1=11 =>2xx x=11+1 =>2xx x=12 =>x=12:2 =>x=6 Vậy x=6 Trả lời
56-4×(2×x-1)=3×2² 56-4×(2×x-1)=3×4 56-4×(2×x-1)=12 4×(2×x-1)=56-12 4×(2×x-1)=44 2×x-1=44:4 2×x-1=11 2×x=11+1 2×x=12 x=12:2 x=6 Vậy x=6 Trả lời
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